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                Light Switches                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div style="text-indent: 24pt"><span style="font-size: medium">题目简述：给定一有向图，边长均为1，求总长小于k的环的个数mod m，什么样的环属于不同详见样例。保证无自环(即g[i,i]='N')</span></div>
<div style="text-indent: 24pt"><span style="font-size: medium">题目详述：minecraft中有很多可爱的生物，比如creeper（更知名的名字：JJ怪）和各路僵尸。在你没有做好足够的准备之前，遇见它们的时候只能逃跑，而且你不希望某些怪物在你辛苦建造的房子旁爆炸。所以你决定对附近的地形进行考察，并设计好一些迂回线路，以同时应对多个怪物。下接题目简述</span></div></p><hr/><h3>输入格式</h3><p><div style="text-indent: 24pt"><span style="font-size: medium">第一行n表示节点个数</span></div>
<div style="text-indent: 24pt"><span style="font-size: medium">接下来n行长度为n的字符串,g[i,j]='Y'表示i到j有一条边，g[i,j]='N'反之。</span></div>
<div style="text-indent: 24pt"><span style="font-size: medium">最后一行两个整数k，m。</span></div></p><hr/><h3>输出格式</h3><p><div style="text-indent: 21pt"><span style="font-size: medium">一个整数表示答案</span></div></p><hr/><h3>样例输入</h3><pre>
4
NYNY
NNYN
YNNN
YNNN
6 100 
</pre><hr/><h3>样例输出</h3><pre>
12 
</pre><hr/><h3>提示</h3><p><p>【样例解释】<br />
12个解分别为：(0,3) ; (3,0) ; (0,1,2) ; (1,2,0) ; (2,0,1);(0,3,0,3) ; (3,0,3,0) ; (0,1,2,0,3) ; (0,3,0,1,2) ; (1,2,0,3,0) ; (2,0,3,0,1) ; (3,0,1,2,0)。 <br />
&nbsp;<br />
【数据范围】<br />
对于30%的数据， n&lt;=40， k&lt;=1000<br />
对于60%的数据, n&lt;=80&nbsp;&nbsp; <br />
对于100%的数据, n&lt;=100, k&lt;=10^6, m&lt;=10^9</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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